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Long-Term Debt - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended |  |
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Jun. 30, 2014 | Mar. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 Commercial Secured Borrowings | Jun. 30, 2014 Commercial Loan Warehouse Facility | Jun. 30, 2014 Commercial Loan Warehouse Facility | Dec. 31, 2013 Commercial Loan Warehouse Facility | Jun. 30, 2014 Senior Notes due 2018 | Jun. 30, 2014 Trust Preferred Securities | Jun. 30, 2013 Trust Preferred Securities | Jun. 30, 2014 Subordinated Notes | Jun. 30, 2013 Subordinated Notes | Jun. 30, 2014 Long-term Debt Maximum | Dec. 31, 2013 Long-term Debt Maximum
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility outstanding amount | $ 0 |  | $ 0 | $ 0 |  | $ 53,000,000 | $ 53,000,000 | $ 49,000,000 |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | 150,000,000 | 150,000,000 |  |  |  |  |  |  |  |
Line of credit facility, maturity period |  |  |  |  |  |  | 15 months |  |  |  |  |  |  |  |
Line of credit facility, average balance |  |  |  |  |  | 51,000,000 | 51,000,000 |  |  |  |  |  |  |  |
Interest expense yield on borrowing |  |  |  |  |  |  | 5.45% |  |  |  |  |  |  |  |
Fair value of commercial loans pledged as collateral |  |  |  |  |  | 85,000,000 | 85,000,000 |  |  |  |  |  |  |  |
Commercial mortgage loans |  |  |  |  | 67,000,000 |  |  |  |  |  |  |  |  |  |
Convertible notes |  | 287,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument interest rate |  | 4.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument maturity year |  | 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument redemption date |  | Apr. 15, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense yield | 5.44% |  | 5.42% |  |  |  |  |  |  | 2.55% | 2.65% | 2.55% | 2.65% |  |
Accrued interest payable | 1,400,000 |  | 1,400,000 | 1,000,000 |  |  |  |  | 3,000,000 |  |  |  |  |  |
Convertible senior notes conversion rate |  |  | 41.1320 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument convertible base principal amount of conversion | 1,000 |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes conversion per share | $ 24.31 |  | $ 24.31 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  | 100,000,000 |  | 40,000,000 |  |  |
Percentage of yield of debt securities |  |  |  |  |  |  |  |  |  | 6.87% | 6.89% | 6.87% | 6.89% |  |
Accrued interest payable balance on long-term debt | $ 7,154,000 |  | $ 7,154,000 | $ 6,366,000 |  |  |  |  |  |  |  |  |  | $ 1,000,000 | $ 1,000,000

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